Continued with file-based stacks and file i/o: - added new interfaces (with some methods) - added those methods to BaseFileIo so all implementations can have it. Still I need to find out if really all can e.g. seek. - Used those new interfaces accordingly Signed-off-by: Roland Häder <roland@mxchange.org>
Continued with file-based stacks: - BaseFileStack now extends BaseStacker and overwrites some methods to have own implementations - renamed 'io' to 'file_directory' Signed-off-by: Roland Häder <roland@mxchange.org>